SAIP 2011 Support
The influence of Pr3+ co-doping on the photoluminescence and cathodoluminescence properties of SiO2:Eu3+ /Tb3+.
Presented by Ms. Gugu MHLONGO on 13 Jul 2011 from 17:00 to 19:00
Type: Poster Presentation
Track: Track A - Condensed Matter Physics and Material Science
<p>Pr3+-Tb3+, and Pr3+-Eu3+ ion pairs co-doped in SiO2 matrix were prepared by a sol-gel method. The photoluminescence (PL) measurements revealed the red and green emissions centred at 614 nm (5D0-7F2) and 541 nm (5D4→7F5) for single doped Eu3+ and Tb3+ ions in SiO2, respectively. Co-doping of Eu3+ and Tb3+ ions with Pr3+ in SiO2 showed that the energy transfer between Pr3+ and nearest Eu3+ and Tb3+ ions takes place. At the same time, however, there was evidence of luminescence quenching of Eu3+ and Tb3+ emissions at certain concentrations of Pr3+. The quenching was also confirmed by cathodoluminescence (CL) measurements recorded from the same powders. . Possible mechanism of energy transfer from Pr3+ to Eu3+ and Tb3+ and its quenching effects are discussed.
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